linux-kernel - Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)

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Date:	Fri, 1 Feb 2008 18:10:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Steven Rostedt <srostedt@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] 2.6.24-git3: Major annoyance during
	suspend/hibernation on x86-64 (bisected)


* Dmitry Adamushko <dmitry.adamushko@...il.com> wrote:

> On 01/02/2008, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > ---
> >  - restore the old wakeup mechanism
> 
> and how does it change behavior, logically-wise?
> 
> do we somehow miss a 'wake-up' from kthread_stop() so that its caller 
> gets blocked until watchdog's msleep_interruptible(10000) timeouts? On 
> average, it would take +-5 sec. and might explain the first 
> observation of Ravael -- "...adds a 5 - 10 sec delay..." (although, 
> lately he reported up to +30 sec. delays).
> 
> (/me goint to also try reproducing it later today)

thanks - i cannot reproduce it on my usual suspend/resume testbox 
because e1000 broke on it, and this is a pretty annoying regression. 
We'll have to undo the hung-tasks detection feature if it's not fixed 
quickly. (there's no point in debugging features that _add_ bugs)

	Ingo
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